The spermatozoon of Oikopleura dioica Fol (Larvacea,Tunicata) |
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Authors: | Per R Flood Dr Björn A Afzelius |
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Institution: | (1) Institute of Anatomy, University of Bergen, Bergen, Norway;(2) Wenner-Gren Institute, University of Stockholm, Stockholm, Sweden;(3) Wenner-Grens Institut, Norrtullsgatan 16, S-113 45 Stockholm, Sverige, Sveden |
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Abstract: | Summary The spermatozoon of Oikopleura dioica is about 30 m long, with a spherical head, about 1 m wide, a 3 m long and 1 m wide midpiece, and a 25 m long tail with a tapered end piece. The head contains a nucleus with the chromatin volume limited to about 0.1 m3. A small acrosome is found in an anterior inpocketing, and a flagellar basal body in a posterior inpocketing of the nucleus. The midpiece contains a single mitochondrion with the flagellar axoneme embedded in a groove along its medial surface. The flagellar axoneme has the typical 9 + 2 substructure, and the basal body the typical 9+0 substructure. A second centriole and special anchoring fibres are absent. |
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Keywords: | Spermatozoon Oikopleura dioica Electron microscopy |
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